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STMicroelectronics LDP01-68AY
- Part No.:
- LDP01-68AY
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Datasheet:
-
LDP01-68AY.pdf
- Description:
- TVS DIODE 58VWM 92VC D2PAK
- Quantity:
- Payment:
- Shipping:
Inventory:5,326
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Product details
Overview
LDP01-68AY from STMicroelectronics is an automotive-grade Transil™ TVS diode designed for load-dump protection in 12 V/24 V vehicle electrical systems. It features a 68 V nominal breakdown voltage (64.4–71.2 V), clamps to ≤92 V at 42 A (10/1000 µs), delivers 495 W peak pulse power at Tj = 25 °C, and operates up to 175 °C junction temperature - deployed across engine control units, body control modules, and infotainment power rails.
For engineers reviewing the LDP01-68AY datasheet, LDP01-68AY pinout, LDP01-68AY application, or LDP01-68AY equivalent, key selection criteria include ISO 7637-2 Pulse 5a/5b compliance, low leakage (<1 µA at 25 °C), D²PAK thermal resistance (0.24 °C/W), and AEC-Q101 qualification for under-hood reliability.
Technical Context
The LDP01-68AY uses planar silicon avalanche technology to achieve precise voltage clamping during load-dump transients (ISO 7637-2 Pulse 5a/5b and ISO 16750-2 Tests A/B). Its unidirectional configuration protects against negative-going surges down to –150 V (Pulse 1) and positive surges up to +112 V (Pulse 2a), with dynamic impedance of 63 mΩ enabling fast response under high-current stress.
Thermal design is enabled by its D²PAK package's low Rth(j-c) (0.24 °C/W), supporting sustained operation at Tj = 175 °C. The device's αT = 10.4 × 10−4/°C temperature coefficient ensures predictable VBR drift across automotive ambient ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage (VBR) | 64.4–71.2 V at IR = 1 mA - defines minimum clamping threshold before avalanche conduction |
| Clamping Voltage (VCL) | ≤92 V at IPP = 42 A (10/1000 µs) - limits downstream IC voltage stress during load dump |
| Peak Pulse Power | 495 W at Tj = 25 °C - supports transient energy absorption per ISO 7637-2 requirements |
| Leakage Current | ≤1 µA at VRM = 58 V and 25 °C - ensures minimal standby power loss in always-on circuits |
| Junction Temperature Range | –55 to +175 °C - enables placement near high-heat sources (e.g., powertrain ECUs) |
| AEC-Q101 Compliance | Qualified per stress test standard - validates reliability for automotive production use |
| Package | D²PAK (TO-263AB) - provides mechanical robustness and thermal path to heatsink or PCB copper |
Pinout & Package
Package: D²PAK (TO-263AB), surface-mount, single-diode configuration with cathode marked on top surface. Thermal pad on underside requires soldered connection to PCB copper pour for optimal heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Tab) | Power return path / GND reference | Electrically connected to exposed metal tab - must be soldered to large copper area for thermal management |
| Cathode (Lead) | Protected line input / surge clamp node | Connected to battery rail or protected circuit - conducts avalanche current during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| Low dynamic impedance | 63 mΩ - minimizes VCL rise under high IPP, improving protection margin for 5 V/3.3 V logic |
| High junction temperature rating | 175 °C max - allows direct mounting on hot ECU boards without derating |
| UL 94 V0 resin housing | Flame-retardant epoxy - meets automotive cabin and engine bay flammability safety standards |
| IEC 61000-4-2 & ISO 10605 compliance | ±30 kV air/contact discharge - safeguards against ESD events during assembly and service |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
Use Scenario: Protects microcontroller power supply from alternator load-dump spikes during battery disconnect. IC Role / Device Role: Unidirectional TVS placed between battery rail and DC-DC input stage. Use Value: Clamps 112 V transients to ≤92 V within 100 ns, preventing damage to buck converter MOSFETs and LDOs. | Use Scenario: Shields LIN bus transceivers and LED drivers from ISO 7637-2 Pulse 3a/3b noise. IC Role / Device Role: Low-leakage TVS on 12 V supply rail feeding lighting and door module electronics. Use Value: <1 µA leakage preserves sleep-mode current budget; 175 °C rating supports under-dash mounting. |
| Infotainment Head Unit | ADAS Camera Power Input |
Use Scenario: Guards USB-C PD controller and audio codec power inputs against jump-start surges. IC Role / Device Role: Primary overvoltage clamp on fused 12 V input before secondary regulation. Use Value: 495 W pulse rating absorbs 400 ms load-dump energy (ISO 16750-2 Test A) without degradation. | Use Scenario: Secures 5 V camera sensor rail against reverse-polarity and load-dump coupling via harness. IC Role / Device Role: Secondary TVS after front-end protection, placed adjacent to image sensor PMIC. Use Value: 63 mΩ RD ensures clamping stays below 5.5 V at 2 A surge, preserving sensor interface integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive TVS protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ64A | DO-214AC package; 64 V VBR; 400 W PPP; Rth(j-c) ≈ 50 °C/W | Lower power handling and higher thermal resistance limit use to lower-energy transients | Select when space-constrained layouts preclude D²PAK and peak currents stay <30 A |
| SMCJ64A | DO-214AB package; 64 V VBR; 1500 W PPP; Rth(j-c) ≈ 15 °C/W | Higher surge capacity but larger footprint and no AEC-Q101 qualification | Choose for non-automotive industrial 24 V systems requiring >1 kW pulse capability |
Compared with SMAJ64A and SMCJ64A, the LDP01-68AY uniquely combines AEC-Q101 qualification, D²PAK thermal performance (0.24 °C/W), and precise 68 V clamping - making it the only option qualified for under-hood automotive deployment where both reliability and thermal density are critical.
Availability
LDP01-68AY is available at Aetrix Electronics and suitable for engine control units, body control modules, and infotainment head units requiring stable component supply across multi-year automotive production cycles.
Supply support for LDP01-68AY includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, power, MCU, and automotive-grade components.
The LDP01-xxAY series belongs to ST's Transil™ automotive TVS portfolio, engineered specifically for robust load-dump and ISO 7637-2 transient suppression in 12 V/24 V vehicle networks.
FAQ
What is the maximum clamping voltage of LDP01-68AY at 42 A (10/1000 µs)?
The maximum clamping voltage is 92 V at IPP = 42 A for a 10/1000 µs waveform, measured per Table 4 in the official datasheet (DocID026556 Rev 2). This value ensures downstream 5 V and 3.3 V regulators remain within absolute maximum ratings during load-dump events.
Is LDP01-68AY bidirectional or unidirectional?
LDP01-68AY is a unidirectional TVS diode, configured to protect against positive transients on a DC rail referenced to ground. Its cathode connects to the protected line and anode to ground - it does not suppress negative surges below ground potential.
Does LDP01-68AY require a heatsink for automotive under-hood use?
No external heatsink is required if the D²PAK tab is soldered to ≥4 cm² of 2 oz copper on the PCB. With Rth(j-c) = 0.24 °C/W and Tj(max) = 175 °C, this layout sustains continuous operation at 125 °C ambient with full-rated surge duty.
How does LDP01-68AY differ from generic 68 V TVS diodes in terms of automotive qualification?
It is fully AEC-Q101 qualified, tested for temperature cycling, humidity bias, and mechanical shock per automotive standards - unlike generic TVS parts. It also meets ISO 7637-2 Pulse 5a/5b and ISO 16750-2 Tests A/B, with guaranteed parameters across –55 to +175 °C junction range.
LDP01-68AY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Series:
- LDP01Y, TRANSIL™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 58V
- Voltage - Breakdown (Min):
- 64.4V
- Voltage - Clamping (Max) @ Ipp:
- 92V
- Current - Peak Pulse (10/1000µs):
- 42A
- Power - Peak Pulse:
- -
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- D2PAK
LDP01-68AY FAQ
1.How can I place an order for LDP01-68AY through Aetrix?
Please submit a Request for Quotation (RFQ) for LDP01-68AY on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LDP01-68AY reliable?
The price and inventory of LDP01-68AY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LDP01-68AY is usually 5 days.
3.What payment methods are accepted for LDP01-68AY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LDP01-68AY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LDP01-68AY?
LDP01-68AY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LDP01-68AY order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LDP01-68AY?
For technical support, including LDP01-68AY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LDP01-68AY requirements.
6.How does Aetrix verify that LDP01-68AY is sourced from the original manufacturer or authorized distributors?
All LDP01-68AY products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LDP01-68AY meets industry standards.
7.What is the process for return or replacement of LDP01-68AY?
All LDP01-68AY units undergo pre-shipment inspection (PSI). If there is an issue with LDP01-68AY, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LDP01-68AY part is unused and in its original packaging.
Return procedure for LDP01-68AY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LDP01-68AY Tags
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